The closer you are to your subjects, with any lens, the less depth of field you will have at any given aperture. When you are shooting a tight image of faces, be sure that you have enough depth of field at your working lens aperture to hold the focus on all the faces. At wide lens apertures, you will need to focus very carefully to keep the eyes, lips, and tip of the nose critically sharp.
This is where a good working knowledge of your lenses is essential. Some lenses will have the majority (two thirds) of their depth of field behind the point of focus; others will have the majority (two thirds) of their depth of field in front of the point of focus. In most cases, depth of field is split 50–50, half in front of and half behind the point of focus.
You should also learn to use the magnification function on your LCD back to inspect the depth-of-field of your images. The viewfinder screen is often too dim to gauge overall image sharpness accurately when the lens is stopped down with the depth-of-field preview. Double-checking the focus on your LCD will help ensure you got the sharpness you wanted.
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